The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain ...The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain both high accuracy and high speed for the position and speed control, A single-stack computer system is constructed and a special control algorithm is prescribed to controled the linear actuator continuously. In this paper, the nonlinear errors resulted from the magnetic saturation and the hysteresis is anaysis and discussed. In the view of electromagnetic propotional control, the actuator is a stage proportional magnet, because the driving current to the linear acuator changes for a number of cycles and a series of reset points will occur as the current undergoes cyclic changes. At each reset point the original starting characteristics of the system are re-established. A large number of reset points across the full stroke of the platform results in a significant reduction in the nonlinear behavior. The stage control is first discussed. Experiments carried out to obtain the characteristics of the mobile platform control system. It is demonstrated that with the introduction of stage control, nonlinearities, such as saturation and hysteresis, are greatly reduced, system stiffness is increased, and the positioning accuracy and resolution are improved. The effect of dither due to a "digital fragment" signal is also examined and found to be crucial in reducing the hysteresis and in improving the resolution accuracy.展开更多
构建数据中心加速服务的软硬件系统级原型平台,需要考虑高计算能力、扩展性、灵活性和低成本等因素.为了提高数据中心的能力,从软硬件协同的角度研究数据中心异构计算在云平台架构、硬件实现、高速互连和应用等方面的创新,研究设计并构...构建数据中心加速服务的软硬件系统级原型平台,需要考虑高计算能力、扩展性、灵活性和低成本等因素.为了提高数据中心的能力,从软硬件协同的角度研究数据中心异构计算在云平台架构、硬件实现、高速互连和应用等方面的创新,研究设计并构建了一个可重构组合的软硬件加速原型系统,简化了现有以处理器为中心的系统级计算平台构建方法,实现目标软硬件设计的快速部署与系统级原型验证.针对以上目标,通过解耦的可重构架构设备虚拟化和远程映射等方法,发掘独立计算单元的潜力,构建了一套ISOF(independent system of FPGA(field programmable gate arrays))软硬件计算平台系统,可使其超越普通服务器设计所能提供的能力,实现计算单元低成本高效扩展,使客户端可灵活使用外设资源,并且为满足系统级通信挑战,设计了一套计算单元之间的通信硬件平台和交互机制.此外,为提升软硬件系统级平台的敏捷性,ISOF提供了灵活统一的调用接口.最后,通过对平台目标系统级的分析评估,验证了该平台在满足了当下计算与加速需求下,保证了高速、低延时的通信,以及良好的吞吐率和弹性扩容效率,另外在高速通信的基础上改进的拥塞避免和丢包恢复机制,满足了数据中心规模通信的稳定性需求.展开更多
随着铁路网络规模的迅速扩展及安全管理压力的日益增加,传统人工巡检模式的局限性愈加凸显,促使各铁路局采用无人机技术替代部分人工巡检作业。针对现有铁路无人机巡检过程中存在的管理缺失、安全风险高等问题,本文设计并搭建了一种基于...随着铁路网络规模的迅速扩展及安全管理压力的日益增加,传统人工巡检模式的局限性愈加凸显,促使各铁路局采用无人机技术替代部分人工巡检作业。针对现有铁路无人机巡检过程中存在的管理缺失、安全风险高等问题,本文设计并搭建了一种基于B/S架构的铁路无人机巡检管理平台。该平台结合GIS(Geographic Information System)技术、深度学习算法与数据可视化方法,开发了基础数据管理、飞行计划管理、病害隐患统计监管、信息综合展示等七大核心功能模块,为无人机飞行作业管控、巡检数据管理、铁路设备病害及外部环境隐患排查提供全面技术支持。现场应用表明,铁路无人机巡检管理平台为铁路无人机巡检作业的数字化转型奠定了基础,提升了作业的智能化、标准化与精细化水平,为铁路安全运行提供了保障。展开更多
文摘The efficient manufacture technique involves a high-speed control of platform mobile system. A linear acutor is presented in this paper. The linear acutor is constructed as a linear stepper motor. However, to sustain both high accuracy and high speed for the position and speed control, A single-stack computer system is constructed and a special control algorithm is prescribed to controled the linear actuator continuously. In this paper, the nonlinear errors resulted from the magnetic saturation and the hysteresis is anaysis and discussed. In the view of electromagnetic propotional control, the actuator is a stage proportional magnet, because the driving current to the linear acuator changes for a number of cycles and a series of reset points will occur as the current undergoes cyclic changes. At each reset point the original starting characteristics of the system are re-established. A large number of reset points across the full stroke of the platform results in a significant reduction in the nonlinear behavior. The stage control is first discussed. Experiments carried out to obtain the characteristics of the mobile platform control system. It is demonstrated that with the introduction of stage control, nonlinearities, such as saturation and hysteresis, are greatly reduced, system stiffness is increased, and the positioning accuracy and resolution are improved. The effect of dither due to a "digital fragment" signal is also examined and found to be crucial in reducing the hysteresis and in improving the resolution accuracy.
文摘构建数据中心加速服务的软硬件系统级原型平台,需要考虑高计算能力、扩展性、灵活性和低成本等因素.为了提高数据中心的能力,从软硬件协同的角度研究数据中心异构计算在云平台架构、硬件实现、高速互连和应用等方面的创新,研究设计并构建了一个可重构组合的软硬件加速原型系统,简化了现有以处理器为中心的系统级计算平台构建方法,实现目标软硬件设计的快速部署与系统级原型验证.针对以上目标,通过解耦的可重构架构设备虚拟化和远程映射等方法,发掘独立计算单元的潜力,构建了一套ISOF(independent system of FPGA(field programmable gate arrays))软硬件计算平台系统,可使其超越普通服务器设计所能提供的能力,实现计算单元低成本高效扩展,使客户端可灵活使用外设资源,并且为满足系统级通信挑战,设计了一套计算单元之间的通信硬件平台和交互机制.此外,为提升软硬件系统级平台的敏捷性,ISOF提供了灵活统一的调用接口.最后,通过对平台目标系统级的分析评估,验证了该平台在满足了当下计算与加速需求下,保证了高速、低延时的通信,以及良好的吞吐率和弹性扩容效率,另外在高速通信的基础上改进的拥塞避免和丢包恢复机制,满足了数据中心规模通信的稳定性需求.
文摘随着铁路网络规模的迅速扩展及安全管理压力的日益增加,传统人工巡检模式的局限性愈加凸显,促使各铁路局采用无人机技术替代部分人工巡检作业。针对现有铁路无人机巡检过程中存在的管理缺失、安全风险高等问题,本文设计并搭建了一种基于B/S架构的铁路无人机巡检管理平台。该平台结合GIS(Geographic Information System)技术、深度学习算法与数据可视化方法,开发了基础数据管理、飞行计划管理、病害隐患统计监管、信息综合展示等七大核心功能模块,为无人机飞行作业管控、巡检数据管理、铁路设备病害及外部环境隐患排查提供全面技术支持。现场应用表明,铁路无人机巡检管理平台为铁路无人机巡检作业的数字化转型奠定了基础,提升了作业的智能化、标准化与精细化水平,为铁路安全运行提供了保障。
